256559783 has 2 divisors, whose sum is σ = 256559784. Its totient is φ = 256559782.

The previous prime is 256559777. The next prime is 256559843. The reversal of 256559783 is 387955652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256559783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256559773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128279891 + 128279892.

It is an arithmetic number, because the mean of its divisors is an integer number (128279892).

Almost surely, 2^256559783 is an apocalyptic number.

256559783 is a deficient number, since it is larger than the sum of its proper divisors (1).

256559783 is an equidigital number, since it uses as much as digits as its factorization.

256559783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268000, while the sum is 50.

The square root of 256559783 is about 16017.4836662942. The cubic root of 256559783 is about 635.4228964239.

The spelling of 256559783 in words is "two hundred fifty-six million, five hundred fifty-nine thousand, seven hundred eighty-three".